The best of Planet Earth: land

Sequoia National Park, California

Why? This small area of California contains the world's largest and
tallest organisms: coast redwoods and sequoias that grow to more than 350ft.

When? Hiking here is best in the summer and autumn.

How? Sequoia National Park rangers (www.nps.gov/seki)
offer a variety of guided walks, while the Giant Forest Museum details the
history of the region. The eight-day, 72-mile High Sierra Trail is one of
North America's great mountain hikes.